Update ci.yml

Author: SimonDanisch

.github/workflows/ci.yml

@@ -44,6 +44,8 @@ jobs:
   docs:
     name: Documentation
     runs-on: ubuntu-latest
+    env:
+      JULIA_PKG_SERVER: ""
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
@@ -52,7 +54,6 @@ jobs:
       - run: |
           julia --project=docs -e '
             using Pkg
-            Pkg.update()
             Pkg.develop(PackageSpec(path=pwd()))
             Pkg.instantiate()'
       - run: |